A variety of 5-alkylsalicylates, 5-alkyl-2-hydroxy-acetophenones, and 5-alkyl-2-hydroxy-benzophenones was regioselectively prepared by TiCl4 mediated formal [3 + 3] cyclization of 1,3-bis(silyl enol ethers) with 2-alkyl-1,1,3,3-tetraethoxypropanes.
通过TiCl 4介导的1,3-双(甲
硅烷基烯醇)的正式[3 + 3]环化反应,选择性地制备了各种5-烷基
水杨酸酯,5-烷基-
2-羟基苯乙酮和5-烷基-2-羟基苯甲酮醚)与2-烷基-
1,1,3,3-四乙氧基丙烷。